/* ─── Reset & Base ─────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-base:        #0d1117;
    --bg-surface:     #161b22;
    --bg-elevated:    #1c2128;
    --bg-hover:       #21262d;
    --border:         #30363d;
    --border-muted:   #21262d;

    --text-primary:   #e6edf3;
    --text-secondary: #8b949e;
    --text-muted:     #484f58;

    --accent-blue:    #388bfd;
    --accent-cyan:    #39d0d8;
    --accent-green:   #3fb950;
    --accent-yellow:  #d29922;
    --accent-red:     #f85149;
    --accent-purple:  #bc8cff;
    --border-subtle:  #1e3a5f;

    --sidebar-width:  220px;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg-base);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.6;
}

a {
    color: var(--accent-blue);
    text-decoration: none;
}

a:hover {
    color: var(--text-primary);
}

/* ─── App Shell ─────────────────────────────────────────────── */
.app-shell {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ─── Sidebar ───────────────────────────────────────────────── */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-surface);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow-y: auto;
}

.sidebar-logo {
    padding: 1.25rem 1rem 1rem;
    border-bottom: 1px solid var(--border-subtle);
}

.sidebar-logo .app-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    display: block;
}

.sidebar-logo .app-tagline {
    font-size: 0.72rem;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sidebar-section {
    padding: 1rem 0 0.5rem;
}

.sidebar-section-label {
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0 1rem 0.4rem;
}

.sidebar-nav {
    list-style: none;
}

.sidebar-nav li a {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-left: 2px solid transparent;
    border-radius: 0 4px 4px 0;
    transition: all 0.15s;
}

.sidebar-nav li a:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
    border-left-color: var(--border);
}

.sidebar-nav li a.active {
    color: var(--accent-cyan);
    border-left-color: var(--accent-cyan);
    background: var(--bg-elevated);
    font-weight: 500;
}

.sidebar-subgroup-label {
    font-size: 0.62rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    padding: 0.5rem 1rem 0.2rem 1.6rem;
    list-style: none;
}

.sidebar-nav li a.nav-indented {
    padding-left: 1.75rem;
}

.sidebar-nav li a .nav-icon {
    font-size: 1rem;
    width: 1.1rem;
    text-align: center;
    flex-shrink: 0;
}

/* Per-item icon colors */
.sidebar-nav li a .icon-exam    { color: var(--accent-cyan); }
.sidebar-nav li a .icon-tutor   { color: var(--accent-purple); }
.sidebar-nav li a .icon-lab     { color: var(--accent-green); }
.sidebar-nav li a .icon-skills  { color: var(--accent-yellow); }
.sidebar-nav li a .icon-flash   { color: var(--accent-yellow); }
.sidebar-nav li a .icon-achieve { color: var(--accent-purple); }
.sidebar-nav li a .icon-cert    { color: var(--accent-yellow); }
.sidebar-nav li a .icon-dash    { color: var(--accent-blue); }
.sidebar-nav li a .icon-practice{ color: var(--accent-cyan); }
.sidebar-nav li a .icon-history { color: var(--accent-purple); }

/* Dimmed coming-soon items keep icon color but mute text */
.sidebar-nav li a.coming-soon {
    opacity: 1;
    cursor: not-allowed;
}
.sidebar-nav li a.coming-soon .nav-label {
    color: var(--text-muted);
    font-size: 0.82rem;
}
.sidebar-nav li a.coming-soon .soon-badge {
    margin-left: auto;
    font-size: 0.6rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--bg-elevated);
    border: 1px solid var(--border-muted);
    border-radius: 3px;
    padding: 0.1rem 0.35rem;
}

/* Sidebar stats at the bottom */
.sidebar-stats {
    margin-top: auto;
    padding: 1rem;
    border-top: 1px solid var(--border-subtle);
}

.sidebar-stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.3rem 0;
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.sidebar-stat .stat-value {
    font-weight: 600;
    color: var(--accent-cyan);
}

/* ─── Main Content ──────────────────────────────────────────── */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 0;
    background: var(--bg-base);
    display: flex;
    flex-direction: column;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.4rem 2rem;
    border-bottom: 1px solid var(--border-subtle);
    background: var(--bg-surface);
    flex-shrink: 0;
    gap: 2rem;
}

.topbar-joke {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 0;
    overflow: hidden;
}

.topbar-joke-label {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    white-space: nowrap;
    flex-shrink: 0;
}

.topbar-joke-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-style: italic;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.joke-rate-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.75rem;
    opacity: 0.35;
    padding: 0 0.1rem;
    transition: opacity 0.15s;
    flex-shrink: 0;
}

.joke-rate-btn:hover {
    opacity: 0.8;
}

.joke-rate-btn.rated {
    opacity: 1;
}

.topbar-xp {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.topbar-xp-level {
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--accent-blue);
    white-space: nowrap;
}

.topbar-xp-bar {
    width: 72px;
    height: 5px;
    background: var(--bg-elevated);
    border-radius: 3px;
    overflow: hidden;
    flex-shrink: 0;
}

.topbar-xp-fill {
    height: 100%;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
}

.topbar-xp-pts {
    font-size: 0.65rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.topbar-xp-next {
    font-size: 0.63rem;
    color: var(--text-muted);
    white-space: nowrap;
}


.main-body {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}

/* ─── Dashboard Header Joke ─────────────────────────────────── */
.header-joke {
    flex-shrink: 0;
    max-width: 340px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent-cyan);
    border-radius: 6px;
    padding: 0.6rem 0.85rem;
}

.joke-label {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    display: block;
    margin-bottom: 0.3rem;
}

.joke-text {
    font-size: 0.78rem;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.5;
}

.page-header {
    margin-bottom: 1.75rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.page-header h1 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
}

.page-header p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* ─── Future Learning ───────────────────────────────────────── */
.future-learning-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1.75rem 0 0;
}

.future-toggle {
    font-size: 0.68rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
}

.future-group {
    margin-bottom: 0.85rem;
}

.future-group:last-child {
    margin-bottom: 0;
}

.future-group-label {
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    margin-bottom: 0.4rem;
}

.future-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.future-tag {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--bg-elevated);
    border: 1px solid var(--border-muted);
    border-radius: 20px;
    padding: 0.2rem 0.65rem;
}

/* ─── Cards ─────────────────────────────────────────────────── */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-top: 2px solid var(--accent-cyan);
    border-radius: 6px;
    padding: 1.25rem;
}

.card-grid {
    display: grid;
    gap: 1rem;
}

.card-grid-2 { grid-template-columns: repeat(2, 1fr); }
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }

.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.1rem 1.25rem;
}

.stat-card .stat-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.4rem;
}

.stat-card .stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-card .stat-sub {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.stat-card.green  { border-left: 3px solid var(--accent-green); }
.stat-card.blue   { border-left: 3px solid var(--accent-blue); }
.stat-card.cyan   { border-left: 3px solid var(--accent-cyan); }
.stat-card.yellow { border-left: 3px solid var(--accent-yellow); }
.stat-card.red    { border-left: 3px solid var(--accent-red); }
.stat-card.purple { border-left: 3px solid var(--accent-purple); }

/* Section header inside content */
.section-header {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin: 1.75rem 0 0.75rem;
}

/* Phase/status badge */
.badge {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 600;
    padding: 0.15rem 0.5rem;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.badge-active  { background: rgba(63,185,80,0.15);  color: var(--accent-green); }
.badge-soon    { background: rgba(56,139,253,0.15);  color: var(--accent-blue); }
.badge-planned { background: rgba(72,79,88,0.3);     color: var(--text-muted); }

/* Progress bar */
.progress-bar {
    height: 5px;
    background: var(--bg-elevated);
    border-radius: 3px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.progress-bar-fill {
    height: 100%;
    border-radius: 3px;
    background: var(--accent-cyan);
    transition: width 0.4s ease;
}

/* ─── Forms ─────────────────────────────────────────────────── */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.4rem;
}

select, textarea, input[type="text"] {
    width: 100%;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 6px;
    padding: 0.55rem 0.8rem;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.15s;
}

select:focus, textarea:focus, input:focus {
    border-color: var(--accent-blue);
}

/* ─── Buttons ───────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1.1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.15s;
}

.btn-primary {
    background: var(--accent-blue);
    color: #fff;
    border-color: var(--accent-blue);
}

.btn-primary:hover {
    background: #1f6feb;
    border-color: #1f6feb;
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--border);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--text-muted);
}

.btn-success {
    background: rgba(63,185,80,0.15);
    color: var(--accent-green);
    border-color: rgba(63,185,80,0.3);
}

/* ─── Difficulty Badge ──────────────────────────────────────── */
.difficulty-badge {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
}
.difficulty-beginner     { background: rgba(63,185,80,0.15);  color: var(--accent-green); }
.difficulty-intermediate { background: rgba(210,153,34,0.15); color: var(--accent-yellow); }
.difficulty-advanced     { background: rgba(248,81,73,0.15);  color: var(--accent-red); }

/* ─── Practice Page ─────────────────────────────────────────── */
.question-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    line-height: 1.8;
    font-size: 0.95rem;
}

.question-topic {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.75rem;
}

.answer-options {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-bottom: 1.25rem;
}

.answer-option {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s;
    font-size: 0.9rem;
}

.answer-option:hover {
    border-color: var(--accent-blue);
    background: var(--bg-hover);
}

.answer-option input[type="radio"] {
    margin-top: 0.15rem;
    accent-color: var(--accent-cyan);
    flex-shrink: 0;
}

.answer-option.selected {
    border-color: var(--accent-cyan);
    background: rgba(57,208,216,0.05);
}

.answer-letter {
    font-weight: 700;
    color: var(--text-secondary);
    flex-shrink: 0;
    width: 1rem;
}

/* ─── Result Feedback ───────────────────────────────────────── */
.result-card {
    border-radius: 6px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1rem;
}

.result-card.correct {
    background: rgba(63,185,80,0.08);
    border: 1px solid rgba(63,185,80,0.3);
}

.result-card.incorrect {
    background: rgba(248,81,73,0.08);
    border: 1px solid rgba(248,81,73,0.3);
}

.result-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.result-card.correct  .result-title { color: var(--accent-green); }
.result-card.incorrect .result-title { color: var(--accent-red); }

.result-answers {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.explanation-box {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1rem;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* ─── Loading ───────────────────────────────────────────────── */
.htmx-indicator {
    display: none;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-left: 0.75rem;
}

.htmx-request .htmx-indicator { display: inline; }

/* ─── Badges ────────────────────────────────────────────────── */
.badge-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    width: 88px;
    cursor: default;
}

.badge-shape-wrap {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.badge-shape {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    font-weight: 700;
    color: #fff;
    transition: transform 0.2s ease;
}

.badge-card:hover .badge-shape { transform: scale(1.08); }

.badge-hex  { width: 72px; height: 72px; clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%); }
.badge-shield { width: 64px; height: 72px; clip-path: polygon(0% 0%, 100% 0%, 100% 65%, 50% 100%, 0% 65%); }
.badge-circle { width: 68px; height: 68px; border-radius: 50%; }

/* Locked */
.badge-shape-locked { background: #21262d; color: #30363d; }

/* Streak — red */
.badge-shape-streak { background: linear-gradient(145deg, #c0392b, #e74c3c); box-shadow: 0 0 10px rgba(231,76,60,0.35); }

/* Knowledge — blue */
.badge-shape-knowledge { background: linear-gradient(145deg, #1a56db, #388bfd); box-shadow: 0 0 10px rgba(56,139,253,0.35); }

/* Milestone — green */
.badge-shape-milestone { background: linear-gradient(145deg, #196f3d, #3fb950); box-shadow: 0 0 10px rgba(63,185,80,0.35); border: 2px solid rgba(63,185,80,0.4); }

/* Elite — gold */
.badge-shape-elite { background: linear-gradient(145deg, #b8860b, #ffd700); box-shadow: 0 0 18px rgba(255,215,0,0.45); animation: badge-pulse 2.5s infinite; }

@keyframes badge-pulse {
    0%, 100% { box-shadow: 0 0 18px rgba(255,215,0,0.45); }
    50%       { box-shadow: 0 0 28px rgba(255,215,0,0.7); }
}

.badge-card-name {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.3;
}

.badge-locked .badge-card-name { color: #484f58; }
.badge-elite  .badge-card-name { color: #ffd700; }
.badge-streak .badge-card-name { color: #e74c3c; }
.badge-knowledge .badge-card-name { color: #388bfd; }
.badge-milestone .badge-card-name { color: #3fb950; }

.badge-card-date {
    font-size: 0.58rem;
    color: var(--text-muted);
    text-align: center;
}

.badge-card-locked {
    font-size: 0.58rem;
    color: #30363d;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ─── Today I Learned Banner ────────────────────────────────── */
.til-banner {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent-purple);
    border-radius: 6px;
    padding: 0.75rem 1.1rem;
    margin-bottom: 1rem;
}

.til-label {
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--accent-purple);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    margin-bottom: 0.35rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.til-category {
    font-size: 0.65rem;
    color: var(--text-muted);
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--bg-elevated);
    border-radius: 3px;
    padding: 0.1rem 0.4rem;
}

.til-fact {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ─── Flashcard Flip ────────────────────────────────────────── */
.fc-scene {
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    height: 220px;
    perspective: 1000px;
    cursor: pointer;
}

.fc-card {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
}

.fc-card.flipped {
    transform: rotateY(180deg);
}

.fc-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 1.5rem 2rem;
    text-align: center;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-top: 2px solid var(--accent-cyan);
}

.fc-back {
    transform: rotateY(180deg);
    border-top-color: var(--accent-green);
}

.fc-hint {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    margin-bottom: 0.75rem;
}

.fc-text {
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.6;
}

/* Rating buttons */
.fc-btn-again { background: rgba(248,81,73,0.12);  color: var(--accent-red);    border-color: rgba(248,81,73,0.3); }
.fc-btn-hard  { background: rgba(210,153,34,0.12); color: var(--accent-yellow); border-color: rgba(210,153,34,0.3); }
.fc-btn-good  { background: rgba(56,139,253,0.12); color: var(--accent-blue);   border-color: rgba(56,139,253,0.3); }
.fc-btn-easy  { background: rgba(63,185,80,0.12);  color: var(--accent-green);  border-color: rgba(63,185,80,0.3); }

.fc-btn-again:hover { background: rgba(248,81,73,0.25);  color: var(--accent-red); }
.fc-btn-hard:hover  { background: rgba(210,153,34,0.25); color: var(--accent-yellow); }
.fc-btn-good:hover  { background: rgba(56,139,253,0.25); color: var(--accent-blue); }
.fc-btn-easy:hover  { background: rgba(63,185,80,0.25);  color: var(--accent-green); }

.fc-interval {
    font-size: 0.68rem;
    opacity: 0.7;
    margin-left: 0.3rem;
}

/* ─── Scrollbars (thin on Windows/Chrome) ───────────────────── */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ─── Responsive ────────────────────────────────────────────── */

/* Laptop / Surface Pro (≤1280px) */
@media (max-width: 1280px) {
    :root { --sidebar-width: 190px; }

    .main-body { padding: 1.25rem 1.5rem; }

    .topbar { padding: 0.4rem 1.25rem; gap: 1rem; }

    .card-grid-4 { grid-template-columns: repeat(2, 1fr); }

    .topbar-xp-pts { display: none; }
}

/* Small laptop (≤1024px) */
@media (max-width: 1024px) {
    :root { --sidebar-width: 170px; }

    .main-body { padding: 1rem 1.25rem; }

    .topbar { padding: 0.4rem 1rem; }

    .topbar-xp-bar { width: 56px; }

    .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
}

/* Tablet / mobile (≤768px) */
@media (max-width: 768px) {
    :root { --sidebar-width: 0px; }

    .sidebar { display: none; }

    .card-grid-2,
    .card-grid-3,
    .card-grid-4 { grid-template-columns: 1fr; }

    .main-body { padding: 1rem; }

    .topbar { padding: 0.4rem 1rem; }

    .topbar-xp { display: none; }
}